Switching assembly for pressure relief valves

ABSTRACT

A switching assembly for diverting fluid flow can include a pair of chambers each having a three-way valve positioned therein. An actuator, which can include a lever and one or more gears, may be coupled with each three-way valve to allow an operator to divert flow through each three-way valve by means of the actuator. The switching assembly can be coupled with one or more pressure relief valves, allowing an operator to safely replace a pressure relief cartridge by diverting flow away from the corresponding pressure relief valve without diverting flow upstream or temporarily shutting off a fluid line.

FIELD OF THE INVENTION

The present invention relates to a switching assembly and systems fordiverting fluid flowing in a pressurized line. More particularly,embodiments of the present invention pertain to assemblies having valveswhich may be simultaneously mechanically actuated by means of a leverand gears. Embodiments of the present invention also pertain to systemsby which fluid flow can be diverted in order to allow for quick, safe,and easy removal and replacement of valves.

BACKGROUND OF THE INVENTION

Heating, ventilation, and air conditioning (“HVAC”) industries, suchcommercial refrigeration, typically employ a variety of safety andregulatory devices and mechanisms to ensure proper functioning, care,and maintenance of their systems. These systems may include valves whichare employed to control, regulate, and divert flow through pipes andlines which may carry fluids such as water, natural gas, or refrigerant.However, when systems malfunction, break, corrode, or otherwise needreplacing, it can often cause issues or pose significant risk theintegrity of the system.

Anhydrous ammonia is used in a great number of industrial refrigerantsystems that is a clear and colorless and exists in liquid or gas form.Though highly efficient in refrigerant systems, exposure to even a smallconcentration of ammonia in the air can cause significant human injury(including death). Ammonia, especially in the presence of moisture, canreact with and corrode copper, zinc, and many alloys. Particularly withindustrial refrigeration systems, precautionary measures are set inplace in order to avoid refrigerant leaks, internal damage, or evenexplosions.

Some precautionary measures may involve the use of pressure reliefvalves, which are coupled with the refrigerant line to allow fluid toescape through a separate relief line when a certain level of pressureis exceeded (known as a “pressure event”), thus avoiding potentialdamage to the system. When the pressure in the line exceeds thethreshold pressure of the pressure relief valve, the pressure reliefvalve opens and allows a portion of the refrigerant to escape throughthe relief line, where it is typically exhausted to the environment orrecaptured. However, like many mechanical safety devices, they must beroutinely checked, repaired, or replaced. When it comes time to remove apressure relief valve, flow to the pressure relief valve must be shutoff or diverted upstream, or the system as a whole must be shut down. Iffluid flow is diverted to a line without another pressure relief valve,the system is susceptible to potential damage and/or hazardous leaksshould a pressure event occur. At the same time, it may not be feasibleto shut the system down completely in order to eliminate.

To overcome some of these challenges, some industrial refrigerantsystems include a main and a backup pressure relief valve. Howeverbecause the exhaust end of both the main and backup pressure reliefvalves are commonly tied to the same relief line, it can be appreciatedthat if either the main or the backup pressure relief valve is removed,and a pressure event occurs, it is possible for the refrigerant releasedby one of the pressure relief valves to travel through the piping andescape at the location where the pressure relief valve was located. Itis, therefore, desirable for a system to have a device by which pressurerelief valve may be replaced, without interruption to a system orpressurized line, and without risk of consequences due to a pressureevent.

BRIEF SUMMARY OF THE INVENTION

The present invention concerns a switching assembly which can divertfluid flow through two or more three-way valves by means of an actuator.In some embodiments, a switching assembly may include a housing havingan inlet and an outlet. In some implementations, a pressurized line offluid may be connected at an inlet and a relief line may be connected toan outlet. The switching assembly housing may also have two or morechambers, each of which may house a three-way valve. In preferredembodiments, each chamber of a switching assembly may house ball-typethree-way valves.

In some embodiments, the present invention may include a plurality ofgears which may be coupled with a three-way valve. For example, andwithout limitation, a switching assembly may include a pair of gears,each coupled with a corresponding three-way valve. In certainembodiments, each gear may also be coupled, or meshed with the otheradjacent gear, such that when one gear rotates, the adjacent gear alsorotates. In a significant aspect of the present invention, the three-wayvalves corresponding to each gear simultaneously rotate when one of thegears is turned—thus the valves open and/or close at the same time. Insome implementations, the gears may be directly meshed, for example andwithout limitation, by the teeth of the gears being interlocked witheach other. In some other implementations, the gears may be meshed withone or more intermediary gears. It is to be appreciated that, in somepreferred embodiments, the pair of gears may be configured to rotate inopposite directions with each other. For example, and withoutlimitation, when a first gear rotates in a clockwise direction, a secondgear rotates in a counter-clockwise direction. However it is to beappreciated that in some other embodiments of the present invention, thegears may be configured to rotate in the same direction.

To turn a gear or three-way valve, in some embodiments, a lever may beprovided. A lever may be coupled directly with a gear, or with a stem ofa three-way valve, to allow a user to mechanically change the positionof each three-way valve. It is to be appreciated that the term “lever”may include a variety of means to mechanically rotate a gear or valve,such as, but not limited to, a knob, wheel, single-bar handle, cross-armhandle, or the like. Alternatively, in certain embodiments, theswitching assembly may include an electric actuator to rotate a gear orstem of a valve. An electric actuator may be activated by a button orswitch (or the like) on the assembly, or by a device operatively engagedtherewith, including but not limited to a system process controller. Anelectric actuator may also be automatically controlled or programmed tochange the position of a three-way valve at a given time.

In some embodiments of the present invention, a switching assembly maybe used in a pressurized system with a pressure relief valve. Forexample, and without limitation, a pressure relief valve (which, in someimplementations and without limitation, may contain a housing and apressure relief valve cartridge) can be coupled with a switchingassembly. In a first configuration, fluid flow may enter through aninlet of the switching assembly and then diverted to the pressure reliefvalve. To divert the fluid flow away from the pressure relief valve(e.g., to replace a pressure relief valve cartridge), the user canactuate the switching assembly to simultaneously rotate each of thethree-way valves within the switching assembly housing, causing flow todivert away from the pressure relief valve.

In a preferred embodiment, a switching assembly may be coupled with apair of pressure relief valves. In one configuration, a pressurized linemay be connected to the switching assembly at an inlet thereof and thedirection of fluid flow may be through the switching assembly to a firstpressure relief valve containing a pressure relief valve cartridge. Ifthe pressure relief valve cartridge needs to be replaced (e.g., if it istripped during a pressure event), a user can actuate the switchingassembly to divert the flow from the first pressure relief valve to asecond pressure relief valve.

In some aspects of the present invention, a switching assembly mayinclude: an assembly housing comprising an inlet, an outlet, a firstchamber, and a second chamber; a first three-way valve comprising afirst stem and a first valve member positioned within the first chamberof the assembly housing; a second three-way valve comprising a secondstem and a second valve member positioned within the second chamber ofthe assembly housing; and an actuator coupled with the first stem andthe second stem. In certain embodiments, the actuator may comprise afirst gear engaged with the first stem, and a second gear engaged withthe second stem.

The first gear may be directly or indirectly mechanically meshed withthe second gear. In some embodiments, the actuator may be adapted torotate the first three-way valve and the second three-way valve inopposite directions. In some embodiments, the actuator may also comprisea lever engaged with the first stem. The first stem and second stem maybe substantially parallel

In some embodiments, a first three-way valve may comprise a first ballvalve and a first valve member may comprise a first ball, and a secondthree way valve may comprise a second ball valve and a second valvemember may comprise a second ball.

In some aspects of the present invention, a system for diverting a fluidflowing in a pressurized line to a relief line may comprise: a switchingassembly having a housing; a first pressure relief valve having ahousing engaged with the switching assembly housing; and a secondpressure relief valve having a housing engaged with the switchingassembly housing. The switching assembly may have a housing with aninlet coupled with the pressurized line, an outlet coupled with therelief line, a first set of ports, and a second set of ports, a firstthree-way valve, a second three-way valve, and an actuator engaged withthe first three-way valve and the second three-way valve. The firstpressure relief housing may have a set of ports, wherein the set ofports of the first pressure relief valve housing may be aligned with thefirst set of ports of the switching assembly housing. The secondpressure relief valve housing may have a set of ports, wherein the setof ports of the second pressure relief valve housing may be aligned withthe second set of ports of the switching assembly housing.

In some embodiments, the actuator may have a first position, wherein inthe first position, a first fluid path may be defined from the switchingassembly housing inlet to the switching assembly housing outlet, througha first port of the first set of ports of the switching assemblyhousing, through a first port of the set of ports of the first pressurerelief valve housing, through a second port of the set of ports of thefirst pressure relief valve housing, and through a second port of thefirst set of ports of the switching assembly housing.

In some embodiments, the actuator may have a second position, wherein inthe second position, a second fluid path may be defined from theswitching assembly housing inlet to the switching assembly housingoutlet, through a first port of the second set of ports of the switchingassembly housing, through a first port of the set of ports of the secondpressure relief valve housing, through a second port of the set of portsof the second pressure relief valve housing, and through a second portof the second set of ports of the switching assembly housing.

In some embodiments of the present invention, a first three-way valvemay have a first stem and a second three-way valve may comprise a secondstem. In certain embodiments, the first three-way valve may have a firstball valve having a first ball, and the second three-way valve may havea second ball valve having a second ball. The first ball may bepositioned within a first chamber of the switching assembly housing, andthe second ball may be positioned within a second chamber of theswitching assembly housing. In some embodiments, the first stem and thesecond stem may be substantially parallel.

In some embodiments, an actuator may have a first gear engaged with thefirst stem and a second gear, meshed with the first gear, and engagedwith the second stem. In certain embodiments, the actuator further mayinclude a lever engaged with the first stem.

In some embodiments of the present invention, a first pressure reliefvalve may have a first pressure relief cartridge positioned in a firstpressure relief valve housing. A plurality of adapters may be providedfor securing the first pressure relief valve housing and a secondpressure relief valve housing to the switching assembly housing.

In accordance with some embodiments of the present invention, a methodfor replacing a pressure relief valve cartridge may include the stepsof: inserting a first pressure relief cartridge into a first pressurerelief valve housing; inserting a second pressure relief cartridge intoa second pressure relief valve housing; and placing an actuator in afirst position. The first and second pressure relief valve housings maybe engaged with a housing of a switching assembly. The actuator may havea first gear engaged with a first stem of a first three-way valve and asecond gear engaged with a second stem of a second three-way valve,where the first gear is meshed with the second gear, and where a portionof each of the first and second three-way valves are be positionedwithin the switching assembly housing.

In some embodiments, while the actuator is in the first position, themethod may further include the steps of: first, removing the firstpressure relief cartridge from the first pressure relief valve housing;then, inserting a third pressure relief cartridge into the firstpressure relief valve housing; and then, placing the actuator in asecond position. While the actuator is in the second position, themethod may further include the steps of: first, removing the secondpressure relief cartridge from the second pressure relief valve housing;then, inserting a fourth pressure relief cartridge into the secondpressure relief valve housing; and then, placing the actuator in thefirst position.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view illustrating an exemplary switchingassembly in accordance with some embodiments of the present invention.

FIG. 2 is a perspective view illustrating an exemplary actuator coupledwith an exemplary first three-way valve and an exemplary secondthree-way valve in accordance with some embodiments of the presentinvention.

FIGS. 3A and 3B are perspective views of the three-way valvesillustrated in FIG. 2, in accordance with some embodiments of thepresent invention.

FIG. 4 is a top view of the switching assembly illustrated in FIG. 1, inaccordance with some embodiments of the present invention.

FIG. 5 is a bottom view of the switching assembly illustrated in FIG. 1,in accordance with some embodiments of the present invention.

FIGS. 6 and 7 are opposite side views of the switching assemblyillustrated in FIG. 1, in accordance with some embodiments of thepresent invention.

FIG. 8 is a diagram illustrating an exemplary direction of fluid flowthrough the switching assembly illustrated in FIG. 1, where the actuatoris in a first position, in accordance with some embodiments of thepresent invention.

FIG. 9 is a diagram illustrating an exemplary direction of fluid flowthrough the switching assembly illustrated in FIG. 1, where the actuatoris in a second position, in accordance with some embodiments of thepresent invention.

FIG. 10 is a perspective view of the switching assembly illustrated inFIG. 1 coupled with an exemplary first pressure relief valve and anexemplary second pressure relief valve, in accordance with someembodiments of the present invention.

FIG. 11 is an exploded view of the switching assembly and pressurerelief valves illustrated in FIG. 10.

FIG. 12 is a perspective view illustrating an exemplary switchingassembly coupled with an exemplary first pressure relief valve and anexemplary second pressure relief valve, in accordance with someembodiments of the present invention.

FIG. 13 is a perspective view illustrating an exemplary switchingassembly coupled with a pressurized fluid line, a relief fluid line, anexemplary first pressure relief valve with a pressure relief valveinserted, and an exemplary second pressure relief valve with a pressurerelief valve inserted, in accordance with some embodiments of thepresent invention.

DETAILED DESCRIPTION OF THE INVENTION

The invention, in its various aspects, will be explained in greaterdetail below. While the invention will be described in conjunction withseveral exemplary embodiments, the exemplary embodiments themselves donot limit the scope of the invention. Similarly, the exemplaryillustrations in the accompanying drawings, where like elements havelike numerals, do not limit the scope of the exemplary embodimentsand/or invention, including any length, angles, or other measurementsprovided. Rather the invention, as defined by the claims, may coveralternatives, modifications, and/or equivalents of the exemplaryembodiments.

In some embodiments of the present invention, a switching assembly mayinclude a housing with one or more chambers therein. Referring to theexemplary illustration of FIG. 1, switching assembly 10 may compriseassembly housing 20 having a first chamber 22 and a second chamber 24therein. The housing chambers may be adapted to receive therein one ormore three-way valves. For example, switching assembly 10 may have afirst three-way valve 42 (illustrated in FIG. 2) positioned within firstchamber 22 and a second three-way valve 43 (illustrated in FIG. 2)positioned within second chamber 24.

As illustrated in FIG. 2, first three-way valve 42 and second three-wayvalve 43 may be coupled with an actuator 30 for simultaneously rotatingeach three-way valve. Actuator 30 of switching assembly 10 may compriselever 31, a first gear 32, and a second gear 33. It is to be appreciatedthat, in some alternative embodiments, an actuator may include a othermeans by which to mechanically rotate a gear or valve, such as, but notlimited to, a knob, a wheel, a handle, or the like. Furthermore, aswitching assembly may include an electric actuator as a means forrotating a gear or valve. In certain embodiments, an electric actuatormay be activated by a button or a switch on the assembly, or by a deviceoperatively engaged therewith (e.g., via a wireless transceiver). Insome embodiments, an electric actuator may be automatically controlledor programmed to be activated at a predefined time or under certainconditions (e.g., immediately following a pressure event).

Lever 31 and first gear 32 of actuator 30 may be coupled with firstthree-way valve 42 via engagement with a first stem 44 thereof (shownmore clearly in FIG. 3A). Similarly, second gear 33 of actuator 30 maybe coupled with second three-way valve 43 via engagement with a secondstem 45 (shown more clearly in FIG. 3B). It is to be appreciated,however, that in some embodiments of the present invention, a lever maybe coupled with a first or a second gear. First gear 32 may also becoupled, or meshed, with second gear 33, so that the rotation of onegear causes rotation of the other gear. By the coupling of the first andsecond gears 32 and 33, it is to be appreciated that in significantaspects of the invention, a user may simultaneously adjust firstthree-way valve 42 and second three-way valve 43 by turning lever 31,rotating first gear 32 or second gear 33, or by rotating first stem 44or second stem 45.

As more clearly shown in FIG. 3A, first stem 44 of first three-way valve42 may be engaged with a first valve member 46. Similarly, second stem45 of second three-way valve 43 may be engaged with a second valvemember 47, as shown in FIG. 3B. In preferred embodiments, the valvemember (or disc) of a three-way valve may include a ball (for example,and without limitation, when the three-way valve is of a “ball” typevalve). In certain embodiments, each stem of each three-way valve may beoriented within the switching assembly such that the central axesthereof are perpendicular to the central (i.e., lengthwise from inlet toan outlet) axis of the switching assembly housing. Furthermore, firststem 44 and second stem 45 may also be oriented in switching assemblyhousing 20 such that each stem may be substantially parallel to theother.

It is to be appreciated that other embodiments and configurations arecontemplated in accordance with the present invention. For example, andwithout limitation, the lever may be coupled with either the firstthree-way valve or the second three-way valve. The lever may also beengaged directly, or integrally formed, with the first stem, the secondstem, the first gear, or the second gear. In certain embodiments, alever may be coupled with a third gear which may be coupled, or meshed,with both the first gear and the second gear.

As illustrated in FIGS. 4 and 5, switching assembly 10 may have a maininlet 21 and a main outlet 29 at the top and bottom, respectively, ofassembly housing 20 (as oriented in FIG. 1). In preferred embodiments, aline of pressurized fluid may be coupled with a main inlet of aswitching assembly and a relief line may be coupled with a main outletof the switching assembly. For example, fluid may flow into switchingassembly 10 via main inlet 21, and the fluid may flow out of switchingassembly 10 via main outlet 29. It is to be appreciated, however, thatthe reference to “inlet” and “outlet” in the figures are relative terms,and does not limit the scope of the invention.

In some embodiments of the present invention, a switching assembly mayinclude one or more ports through which fluid may flow. As illustratedin FIGS. 6 and 7, switching assembly 10 may comprise a first set ofports 23A and 25A on a first side of assembly housing 20. Similarly,switching assembly 10 may comprise a second set of ports 23B and 25B ona second side of assembly housing 20. When fluid enters switchingassembly 10 through main inlet 21, the fluid may be diverted out offirst chamber 22 through either port 23A or 23B, depending on theconfiguration of three-way valve 42. In preferred embodiments, and asfurther illustrated below (and with reference to FIGS. 10-13), afterexiting port 23A or 23B, the fluid may enter into a pressure reliefvalve. Fluid may be diverted back into switching assembly 10 througheither port 25A or 25B, depending on the configuration of three-wayvalve 43. It is to be appreciated, however, that reference to diversion“in” or “out” in the figures are relative terms, and does not limit thescope of the invention.

Exemplary fluid flow paths are illustrated in FIGS. 8 and 9, and withreference to these examples, it is to be appreciated that “in,” “out,”“enter,” “exit,” “clockwise,” and “counterclockwise” are relative termswhich do not limit the scope of the invention. In one implementation ofthe present invention, fluid flow through switching assembly 10 may bediverted according to the diagram of FIG. 8. In this configuration,lever 31 is fully turned in a clockwise direction to orient eachthree-way valve (not visible) in a first position. In this firstposition, fluid may enter through the main inlet of switching assembly10 in the direction indicated by A₁. The fluid may then diverted withinthe first chamber causing the fluid to flow out of switching assembly 10through port 23A in the direction indicated by B₁. Fluid returning toswitching assembly 10 (e.g., through a direct or branched return pipe,or a housing), may reenter through port 25A of the second chamber in thedirection indicated by C₁. The fluid may then be diverted back out ofswitching assembly 10 through the main outlet thereof in the directionindicated by D₁.

In another implementation of the present invention, and in accordancewith the exemplary diagram of FIG. 9, to change the direction of fluidflow through switching assembly 10, the lever 31 can be fully turned ina counterclockwise direction, causing each three-way valve to rotateapproximately 90 degrees. In this second position, fluid may enterthrough the main inlet of switching assembly 10 in the directionindicated by A₂. The fluid may then be diverted within the first chambercausing the fluid to flow out of switching assembly 10 through port 23Bin the direction indicated by B₂. Fluid returning to switching assembly10 may reenter through port 25B of the second chamber in the directionindicated by C₂. The fluid may then be diverted back out of switchingassembly 10 through the main outlet thereof in the direction indicatedby D₂.

In some embodiments of the present invention, a switching assembly canbe coupled with one or more pressure relief valves. A pressure reliefvalve may include a housing and a cartridge which allows fluid to passthrough the relief valve housing only when a set level of pressure isexceeded. Although reference to the invention as exemplified in theFigures is made with respect to a certain style of pressure reliefvalve, it is to be appreciated that embodiments pertain to other stylesof pressure relief valves, including but not limited torising/non-rising stem valves, gate valves, quick release valves,butterfly valves, and globe valves.

Referring to FIGS. 10 and 11, switching assembly 10 may be coupled witha first pressure relief valve 50A and a second pressure relief valve50B. First pressure relief valve 50A may comprise a relief valve housing60A which may be secured to a first side of assembly housing 20 ofswitching assembly 10 by one or more fasteners 52. Similarly, secondpressure relief valve 50B may comprise a relief valve housing 60B whichmay be secured to a second side of assembly housing 20 of switchingassembly 10 by one or more fasteners 52.

In some embodiments, a pressure relief valve may have one or more portsthrough which fluid may flow between the pressure relief valve and aswitching assembly. For example, pressure relief valve housings 60A and60B may each comprise a set of ports which may be complementary to theports of switching assembly 10, through which fluid may enter or exiteach pressure relief valve housing. Pressure relief valve housing 60Amay comprise ports which may be aligned with ports 23A and 25A ofassembly housing 20, respectively, when switching assembly 10 is engagedwith first pressure relief valve 50A. Similarly, pressure relief valvehousing 60B may comprise ports which may be aligned with ports 23B and25B of assembly housing 20, respectively, when switching assembly 10 isengaged with second pressure relief valve 50B.

When first pressure relief valve 50A and second pressure relief valve50B are engaged with switching assembly 10, fluid may flow out of firstchamber 22 and into one of relief valve housings 60A or 60B through oneof the ports thereof, depending on the status of a first three-way valve(for example, and without limitation, three-way valve 42 as illustratedin FIG. 2). The fluid may then pass through either pressure relief valvehousing 60A or 60B and, upon a pressure event, exit through a differentport of pressure relief favle housing 60A or 60B to reenter switchingassembly 10 into second chamber 24. For example, when lever 31 ofswitching assembly 10 is fully turned in the clockwise direction (asshown in FIG. 10), fluid entering switching assembly 10 through the topside thereof is diverted to first pressure relief valve 50A. In thiscase, the direction of fluid flow is analogous to the directionindicated in FIG. 8: fluid flows out of the first chamber of switchingassembly 10 and into the top portion of first pressure relief valve 50A;the fluid then flows through first pressure relief valve 50A and exitsfrom the bottom portion thereof, thereby returning to switching assembly10 within the second chamber thereof; the fluid is then diverted out ofswitching assembly 10 through the bottom side thereof. To divert theflow through second pressure relief valve 50B, a user may turn lever 31in a counterclockwise direction to simultaneously rotate each three-wayvalve.

In an exemplary implementation of the present invention, a switchingassembly may allow a user to easily replace a pressure relief valvecartridge without having to divert or shut off fluid flow upstream. Forexample, if a pressure event occurred in a pressurized system comprisinga switching assembly coupled with a pair of pressure relief valves, auser (or operator) could safely remove the activated pressure reliefvalve cartridge from the corresponding (active) pressure relief valve.To remove the activated pressure relief valve cartridge, the user mayfully turn the actuator lever of the switching assembly so that fluidflow is redirected to the other pressure relief valve containing theunactivated pressure relief cartridge. Once the fluid is diverted, theuser can remove the activated pressure relief valve cartridge from thecorresponding pressure relief valve housing and replace it. The user maythen, optionally, return the actuator lever to its original position sothat fluid flow returns to the pressure relief valve with the newlyreplaced pressure relief cartridge.

It is to be appreciated that embodiments of the present invention arenot limited to “cartridge” style pressure relief valves. For example,and without limitation, some embodiments of the present inventionpertain to single use pressure relief valves. In such examples, there isno cartridge to remove, and the switching assembly of the presentinvention enables a user to disengage or remove the entire pressurerelief valve (including the housing) from the switching assemblyhousing. In accordance with some embodiments of the present invention, aswitching assembly may also be adapted to be used with a variety oftypes of pressure relief valve cartridges and housings. In order toaccommodate other types of pressure relief valves, an adapter or mountmay be used to secure a pressure relief valve housing to a switchingassembly housing. For example, as further illustrated in FIG. 11, asystem may include one or more adapters 26 to help secure differentstyles of pressure relief valve housings 50A and/or 50B to switchingassembly housing 20. It is to be appreciated that an adapter (orconnector, converter, coupler, or other like terms) may be constructedaccording to the design and configuration of the switching assemblyhousing and/or the pressure relief valve housing, such that variationsin design and function thereof can be accommodated for.

For example, as illustrated in FIG. 12, switching assembly 110 may becoupled with a pair of pressure relief valves 150A and 150B. Relative topressure relief valves 50A and 50B, pressure relief valves 150A and 150Bmay be used to accommodate other types of pressure relief valvecartridges. Similar to the above described examples, switching assembly110 may comprise a first (upper) three-way valve and a second (lower)three-way valve (not visible). Switching assembly 110 may also include aplate 135 partially enclosing, or covering, the actuator for thethree-way valves. Similar to exemplary actuators previously described,lever 131, may be coupled with one or more gears or stems of three-wayvalves.

As illustrated in FIG. 13, pressurized fluid line 3 and relief line 5may be engaged with switching assembly 210. Switching assembly 210 maybe coupled with pressurized fluid line 3 and relief line 5 via an inleton the top side of switching assembly 210 and an outlet on the bottomside of switching assembly 210, respectively. First pressure reliefvalve 250A and a second pressure relief valve 250B may be engaged withswitching assembly 210. Inserted into first pressure relief valve 250Amay be pressure relief valve cartridge 270A, and inserted into secondpressure relief valve 250B may be pressure relief valve cartridge 270B.If a pressure event were to occur within pressurized fluid line 3,second pressure relief valve 270B may be activated (pressure reliefvalve 250B would be activated since the actuator lever is in a fullycounterclockwise turned position), releasing fluid through the outlet ofswitching assembly 210 and into relief line 5. To replace pressurerelief valve cartridge 270B, a user (or operator) may fully turn theactuator lever in a clockwise direction, thereby diverting fluid flow tofirst pressure relief valve 250A.

In use, a user may insert pressure relief cartridge 270A into pressurerelief valve housing 250A, insert pressure relief cartridge 270B intosecond pressure relief valve housing 250B, and place the actuator in afirst position (for example, by rotating the lever in acounterclockwise). When the actuator is in the first position the systemhas a fluid path towards pressure relief valve housing 250B. It istherefore possible to thereafter safely remove pressure relief cartridge270A from pressure relief valve housing 250A and insert a new pressurerelief cartridge into pressure relief valve housing 250A. After placingthe actuator in a second position (for example, by rotating the lever ina clockwise direction), the system has a fluid path towards pressurerelief valve housing 250A. It is therefore possible to thereafter safelyremove pressure relief cartridge 270B from pressure relief valve housing250B and insert a new pressure relief cartridge into pressure reliefvalve housing 250B.

It is to be understood that variations, modifications, and permutationsof embodiments of the present invention may be made without departingfrom the scope thereof. It is also to be understood that the presentinvention is not limited by the specific embodiments, descriptions, orillustrations or combinations of either components or steps disclosedherein. Thus, although reference has been made to the accompanyingfigures, it is to be appreciated that these figures are exemplary andare not meant to limit the scope of the invention. For example, theabove exemplary embodiments describe the use of an actuator with twogears, which allows each three-way valve to rotate in oppositedirections when one gear is turned. It is to be appreciated, however,that an actuator may comprise a third gear centrally positioned between,and coupled with, each of the gears which are coupled with eachthree-way valve. In this configuration, rotation of one gear causes eachthree-way valve to rotate in the same direction.

Furthermore, it is to be appreciated that a switching assembly, inaccordance with some embodiments of the present invention, may be used,or adapted to be used, with a variety of types of valves and housings.Any such use or adaptation of the present invention may be made withoutdeparting from the scope thereof.

Moreover, it is to be understood that the present invention may not belimited to use on a single line of fluid. For example, and withoutlimitation, separate lines (i.e., lines emanating from differentsources) may be connected to a switching assembly, such that fluid mayenter the switching assembly at both the main inlet and main outlet. Inthis case, separate lines of fluid can be diverted, simultaneously, bymeans of the switching assembly actuator. In this example, if aswitching assembly were configured as shown in FIGS. 8 and 9, thedirection of fluid flow through one chamber would mirror the directionof fluid flow in the other.

What is claimed is:
 1. A switching assembly comprising: a) an assemblyhousing comprising an inlet, an outlet, a first chamber, and a secondchamber; b) a first three-way valve comprising a first stem and a firstvalve member, wherein said first valve member is positioned within saidfirst chamber of said assembly housing; c) a second three-way valvecomprising a second stem and a second valve member, wherein said valvemember is positioned within said second chamber of said assemblyhousing; and d) an actuator coupled with said first stem and said secondstem.
 2. The switching assembly of claim 1, wherein said actuatorcomprises a first gear engaged with said first stem, and a second gearengaged with said second stem.
 3. The switching assembly of claim 2,wherein said first gear is meshed with said second gear.
 4. Theswitching assembly of claim 2, wherein said actuator further comprises alever engaged with said first stem.
 5. The switching assembly of claim1, wherein said actuator is adapted to rotate said first three-way valveand said second three-way valve in opposite directions.
 6. The switchingassembly of claim 1, wherein said first stem and said second stem aresubstantially parallel.
 7. The switching assembly of claim 1, whereinsaid first three-way valve comprises a first ball valve and said firstvalve member comprises a first ball, and wherein said second three wayvalve comprises a second ball valve and said second valve membercomprises a second ball.
 8. A system for diverting a fluid flowing in apressurized line to a relief line comprising: a) a switching assemblycomprising (i) a housing having an inlet coupled with said pressurizedline, an outlet coupled with said relief line, a first set of ports, anda second set of ports, (ii) a first three-way valve, (iii) a secondthree-way valve, and (iv) an actuator engaged with said first three-wayvalve and said second three-way valve; b) a first pressure relief valvehaving a housing having a set of ports and engaged with said switchingassembly housing, wherein said set of ports of said first pressurerelief valve housing are aligned with said first set of ports of saidswitching assembly housing; and c) a second pressure relief valve havinga housing having a set of ports and engaged with said switching assemblyhousing, wherein said set of ports of said second pressure relief valvehousing are aligned with said second set of ports of said switchingassembly housing.
 9. The system of claim 8, wherein said actuatorcomprises a first position, wherein in said first position, said systemcomprises a first fluid path defined from said switching assemblyhousing inlet to said switching assembly housing outlet, through a firstport of said first set of ports of said switching assembly housing,through a first port of said set of ports of said first pressure reliefvalve housing, through a second port of said set of ports of said firstpressure relief valve housing, and through a second port of said firstset of ports of said switching assembly housing.
 10. The system of claim9, wherein said actuator comprises a second position, wherein in saidsecond position, said system comprises a second fluid path defined fromsaid switching assembly housing inlet to said switching assembly housingoutlet, through a first port of said second set of ports of saidswitching assembly housing, through a first port of said set of ports ofsaid second pressure relief valve housing, through a second port of saidset of ports of said second pressure relief valve housing, and through asecond port of said second set of ports of said switching assemblyhousing.
 11. The system of claim 8, wherein said first three-way valvecomprises a first stem and said second three-way valve comprises asecond stem.
 12. The system of claim 11, wherein said first three-wayvalve comprises a first ball valve having a first ball, wherein saidsecond three-way valve comprises a second ball valve having a secondball, where wherein said first ball is positioned within a first chamberof said switching assembly housing, and wherein said second ball ispositioned within a second chamber of said switching assembly housing.13. The system of claim 11, wherein said actuator comprises a first gearengaged with said first stem and a second gear, meshed with said firstgear, and engaged with said second stem.
 14. The system of claim 13,wherein said first stem and said second stem are substantially parallel.15. The system of claim 11, wherein said actuator further comprises alever engaged with said first stem.
 16. The system of claim 8, whereinsaid first pressure relief valve comprises a first pressure reliefcartridge positioned in said first pressure relief valve housing. 17.The system of claim 8, further comprising a plurality of adapters forsecuring each said first and said second pressure relief valve housingsto said switching assembly housing.
 18. A method comprising the stepsof: a) inserting a first pressure relief cartridge into a first pressurerelief valve housing, said first pressure relief valve housing engagedwith a housing of a switching assembly; b) inserting a second pressurerelief cartridge into a second pressure relief valve housing, saidsecond pressure relief valve housing engaged with said housing of saidswitching assembly; and c) placing an actuator in a first position, saidactuator having a first gear engaged with a first stem of a firstthree-way valve and a second gear, meshed with said first gear, engagedwith a second stem of a second three-way valve, wherein a portion ofeach of said first and second three-way valves are positioned withinsaid switching assembly housing.
 19. The method of claim 18, furthercomprising the steps of, while said actuator is in said first position:d) first, removing said first pressure relief cartridge from said firstpressure relief valve housing; e) then, inserting a third pressurerelief cartridge into said first pressure relief valve housing; and f)then, placing said actuator in a second position.
 20. The method ofclaim 19, further comprising the steps of, while said actuator is insaid second position: g) first, removing said second pressure reliefcartridge from said second pressure relief valve housing; h) then,inserting a fourth pressure relief cartridge into said second pressurerelief valve housing; and i) then, placing said actuator in said firstposition.